Counts the number of white space characters at the start of the string.
Details
Used in toc_determine_hierarchy function to determine hierarchy. Hierarchy is defined in Eurostat .txt format TOC files by the number of white space characters at intervals of four. For example, " Foo" (4 white space characters) is one level higher than " Bar" (8 white space characters). "Database by themes" (0 white space characters before the first alphanumeric character) is highest in the hierarchy.
The function will return a warning if the input has white space in anything else than as increments of 4. 0, 4, 8... are acceptable but 3, 6, 10... are not.
See also
get_eurostat_toc() toc_count_children() toc_determine_hierarchy()
toc_list_children() toc_count_whitespace()
Examples
strings <- c(" abc", " cdf", "no_spaces")
for (string in strings) {
whitespace_count <- eurostat:::toc_count_whitespace(string)
cat("String:", string, "\tWhitespace Count:", whitespace_count, "\n")
}
#> String: abc Whitespace Count: 4
#> String: cdf Whitespace Count: 2
#> String: no_spaces Whitespace Count: 0